Before trying to compile the source code, rename app/src/env_variables.h.example
to app/src/env_variables.h
and set your openweathermap.org api key ( https://openweathermap.org/appid )
Tutorial Video: https://youtu.be/0P77SvR9b40
Thingiverse: https://www.thingiverse.com/thing:3883019